TPS65400: Turn on the power supply without I2C configuration

Andrea Bernaschina1

Part Number: TPS65400

Hi,
I have a problem with my PCB design. Unfortunately I make a design without considering the I2C access for the configuration.

I would like to ask you, if:

There is a quick way to set un the IC without program it? I measured the generated voltage VDDG, VDDA and VDDD and ar all ok. the problem is that the value of the 4 EN channels are set to '0'. I can connect it for example to VDDD or VDDG or VDDA?
If the only solution is to configure it via I2C. Could you help me providing advice in how to set up the IC. I need a basic way to turn on the 4 channel when I plug the VIN. Without order sequence or other issue.

Thank you for your big help
Best regards

Andrea

over 6 years ago

0 Sam(MPAA) Zhang over 6 years ago

TI__Mastermind 19080 points

Hi Andrea,

I2C is not necessary to power up the device. What's the configuration for the EN pins? You may try to set them floating.

Regards,

Hao

0 Andrea Bernaschina1 over 6 years ago in reply to Sam(MPAA) Zhang

Prodigy 30 points

Hi Hao,

thank you for your quick reply.
The 4x EN pins are connected to a capacitor. Please see the attached schema.

Thank you for the help
Best regards
Andrea

0 Sam(MPAA) Zhang over 6 years ago in reply to Andrea Bernaschina1

TI__Mastermind 19080 points

Hi Andrea,

The ENx are internally pull up, should be able to enable if only a cap is connected...

Have you measured the voltage on ENx? If it's logic low, you can use an external power supply, or pull up to VDDD, and see if you can power the device up.

Thanks!

Regards,

Hao

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TPS65400: Turn on the power supply without I2C configuration